Lithium ion battery cathode material rich in lithium and manganese and preparation method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low discharge specific capacity and poor rate performance, and achieve the effects of rich sources, good rate performance, and cost reduction

Active Publication Date: 2015-07-29
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of realizing the present invention, the inventors have found that there are at least the following problems in the prior art: the existing lithium-rich manganese cathode materials have low discharge specific capacity and poor rate performance at higher rates

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  • Lithium ion battery cathode material rich in lithium and manganese and preparation method thereof
  • Lithium ion battery cathode material rich in lithium and manganese and preparation method thereof
  • Lithium ion battery cathode material rich in lithium and manganese and preparation method thereof

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preparation example Construction

[0034] The second aspect of the present invention provides a preparation method of the lithium-ion battery lithium-rich manganese cathode material according to the first aspect of the present invention, the preparation method comprising the following steps:

[0035] Step (1), according to xLi 2 MnO 3 ·(1-x)LiNi 0.5-a / 2 mn 0.5-a / 2 Fe a o 2 The stoichiometric ratio of lithium salts, nickel salts, iron salts and manganese salts is dissolved in water to obtain an aqueous solution of metal ions, and the total concentration of metal ions in the aqueous solution of metal ions is 0.2 to 3 mol / L;

[0036] Step (2), adding a chelating agent into the metal ion aqueous solution, stirring and dispersing evenly; the ratio of the amount of substances of the chelating agent to the total amount of metal ions is 1 to 1.2:1;

[0037] Step (3), drying the mixed solution obtained in step (2) with a spray dryer to obtain the precursor material of the lithium-rich manganese cathode material; th...

Embodiment 1

[0052] This embodiment provides a lithium-ion battery rich manganese cathode material and its preparation method, the prepared lithium-rich manganese cathode material has a chemical formula: 0.5Li 2 MnO 3 0.5LiNi 0.49 mn 0.49 Fe 0.02 o 2 , the preparation method is as follows:

[0053] Step (1), according to the ratio of Li:Ni:Fe:Mn=1.575:0.245:0.01:0.745 (molar ratio, the same below), lithium acetate, nickel chloride, ferric chloride and manganese nitrate are dissolved in deionized water to obtain A metal ion aqueous solution with a total concentration of metal ions of 1 mol / L; wherein, the excess of lithium salt is 5%, to compensate for a small amount of volatilization of lithium salt when calcined at high temperature;

[0054] Step (2), adding citric acid to the metal ion aqueous solution, stirring and dispersing evenly; the ratio of the amount of citric acid to the total amount of metal ions is 1.05:1;

[0055] Step (3), drying the mixed solution obtained in step (2)...

Embodiment 2

[0062] This embodiment provides a lithium-ion battery rich lithium manganese positive electrode material and its preparation method, the chemical formula of the prepared lithium rich manganese positive electrode material is: 0.2Li 2 MnO 3 0.8LiNi 0.48 mn 0.48 Fe 0.04 o 2 , the preparation method is as follows:

[0063] Step (1), according to the ratio of Li:Ni:Fe:Mn=1.224:0.384:0.032:0.584 lithium nitrate, nickel acetate, ferric chloride and manganese sulfate are dissolved in deionized water to obtain a total concentration of metal ions of 2.0mol / The metal ion aqueous solution of L; Wherein, lithium salt excess 2%, to compensate a small amount of volatilization when lithium salt is calcined at high temperature;

[0064] Step (2), adding acrylic acid to the metal ion aqueous solution, stirring and dispersing evenly; the ratio of the amount of acrylic acid to the total amount of metal ions is 1.01:1;

[0065] Step (3), drying the mixed solution obtained in step (2) with a...

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Abstract

The invention discloses a lithium ion battery cathode material rich in lithium and manganese and a preparation method thereof, and belongs to the technical field of preparation of the lithium ion battery cathode material. The chemical formula of the cathode material rich in lithium and manganese, provided by the invention is xLi2MnO3. (1-x)LiNi(0.5-a / 2)Mn(0.5-a / 2)FeaO2, wherein the x is not smaller than 0.1 and not greater than 0.9 and the a is not smaller than 0.002 and not greater than 0.008. When the accumulative particle size distribution percentage of the cathode material rich in lithium and manganese reaches 50%, the corresponding particle size is 0.1-0.8 micrometer. The particle size of the cathode material rich in lithium and manganese, provided by the invention is submicron level. Comparatively fine particle size facilitates that the cathode material rich in lithium and manganese is in full contact with electrolyte, can shorten the diffusion path of Li+, and results in the good rate performance of the lithium ion battery using the cathode material rich in lithium and manganese, provided by the invention as the positive active material, wherein the specific discharge capacity of the lithium ion battery at the rate of 5C keeps over 150 mAh / g.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a lithium-rich manganese positive electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] As a high-energy storage battery, lithium-ion batteries have the advantages of high energy density, long service life, good cycle performance and no memory effect. Lithium-ion battery cathode material is an important part of lithium-ion batteries, and it has an important impact on the electrochemical performance of lithium-ion batteries. Common cathode materials for lithium-ion batteries (LiCoO 2 , LiMn 2 o 4 、LiFePO 4 ) can no longer meet people's demand for high-capacity, high-energy-density electronic products. Layered lithium-rich manganese cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Mn, Ni, Co, Ni 0.5 mn 0.5 , Cr, Ni 1 / 3 co 1 / 3 mn 1 / 3 , Fe...) is a kind of α-N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘三兵梅周盛
Owner CHERY AUTOMOBILE CO LTD
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